People who decry the fact that businesses are in business "just to make money" seldom understand the implications of what they are saying. You make money by doing what other people want, not what you want.

Writing is like sex. First you do it for love, then you do it for your friends, and then you do it for money.

The truth is always something that is told, not something that is known.

"If you surrendered to the air, you could ride it."

每一个数学问题都是通向更深入理解世界的窗口。